Summary
This article describes an update that makes time zone and daylight saving time (DST) changes in Windows. Before you install this update, see the Prerequisites section.
This update applies to the following operating systems:
- Windows Server 2012 R2
- Windows 8.1
- Windows RT 8.1
- Windows Server 2012
- Windows Embedded 8
- Windows Server 2008 R2 Service Pack 1 (SP1)
- Windows 7 SP1
- Windows Server 2008 Service Pack 2 (SP2)
- Windows XP Embedded
Note To get the update for Windows 10 and Windows Server 2016, install the latest cumulative updates that are listed in the Windows 10 and Windows Server 2016 update history page.
Changes by location
Northern Cyprus
Northern Cyprus set its clocks back one hour for daylight saving time (DST) on October 29, 2017, after making no DST changes for the past year. We recommend that all users change their time zone setting from "Istanbul" to the new "Athens, Bucharest" entry.
| Time zone key name | Old time zone | New time zone |
|---|---|---|
| GTB Standard Time | (UTC+03:00) Istanbul | (UTC+02:00) Athens, Bucharest |
Sudan
The Republic of Sudan switched from UTC+03:00 to UTC+02:00 on November 11, 2017. To accommodate this change, a new time zone was created.
| Time zone key name | New time zone |
|---|---|
| Sudan Standard Time | (UTC+02:00) Khartoum |
Tonga
The Kingdom of Tonga cancelled its DST observance this year. DST was previously scheduled to start on November 5, 2017. DST is no longer observed in Tonga.
| Time zone key name | Display name | Old DST start date |
|---|---|---|
| Tonga Standard Time | (UTC+13:00), Nuku'alofa Island | November 5, 2017 |
Update information
The update that is described in this article makes changes in the time zone setting for The Republic of Sudan and in the DST settings for Northern Cyprus and the Kingdom of Tonga.
For more information about how DST changes may affect other Microsoft products, go to the following Microsoft website:
For more information about how DST changes may affect other Microsoft products, click the following article number to go to the article in the Microsoft Knowledge Base:
914387 How to configure daylight saving time for Microsoft Windows operating systems
Note When you apply this update, you may receive a message that resembles the following:
Note
Update cannot be installed as a newer or same time zone update has already been installed on the system.
This message indicates that either you have already applied the correct update or Windows Updates or Microsoft Update has automatically installed this update. No additional action is required to update the Windows operating system.
How to get this update
Windows Server 2012 R2, Windows 8.1, Windows Server 2012, Windows Server 2008 R2 SP1, Windows 7 SP1
Method 1: Windows Update
This update is provided as part of an Optional update rollup on Windows Update. To learn more about the update rollups that have been released for these operating systems, see the following Microsoft Knowledge Base articles:
Windows 8.1 and Windows Server 2012 R2 update history
Windows 7 SP1 and Windows Server 2008 R2 SP1 update history
Windows Server 2012 update history
For more information about how to run Windows Update, see How to get an update through Windows Update.
Method 2: Windows Server Update Service
This update is now available for installation through WSUS.
Method 3: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
Note You must be running Microsoft Internet Explorer 6.0 or a later version.
Windows Server 2008 SP2
Method 1: Windows Update
This update is provided as an Optional update on Windows Update. For more information about how to run Windows Update, see How to get an update through Windows Update.
Method 2: Windows Server Update Service
This update is now available for installation through WSUS.
Method 3: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog website.
Note You must be running Microsoft Internet Explorer 6.0 or a later version.
Prerequisites
To apply this update, you must have the April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed on Windows 8.1 or Windows Server 2012 R2. Or, install Service Pack 1 for Windows 7 or Windows Server 2008 R2. Or, install Service Pack 2 for Windows for Windows Server 2008.
There are no prerequisites to install this update on Windows Server 2012.
Registry information
To apply this update, you do not have to make any changes to the registry.
Restart requirement
You do not have to restart the computer after you install this update.
References
Learn about the terminology that Microsoft uses to describe software updates.